This guy is really on the money here. His name is Johnathan but he goes by the name Ellaskins. He lives in the U.K. and damn if he doesn't know his stuff. DJ Ellaskins, along with several other DJs, have formed DJ Tutor, an awesome online resource for DJs everywhere.
In this clip, DJ Ellaskins explains the thinking behind moving the crowd on the dance floor. It's really interesting. I am a huge believer of this concept because I've experienced it firsthand. Check out what he has to say: